**8. Conclusions**

In the process of studying the biology of local grape varieties of the Crimean region investigated the possibility of their use in breeding to obtain more adaptive grape varieties that can be competitive in the viticulture and winemaking market. The grape plant in more than 2000 years of culture has shown in itself an exceptionally high adaptive capacity to stress factors. Nevertheless, thanks to introgression of genes of resistance to drought, low temperatures, and pathogens, we are able to manage the genetic diversity of the crop and create a wide range of new grape varieties.

Thus, we can state: according to the main economic parameters, the most profitable for cultivation without irrigation in the eastern South Coast zone of viticulture of Crimea among the native grape varieties are 'Gevat Kara', 'Kokur Belyi' and 'Kapselski Belyi'. A group of varieties including 'Kefesiya', 'Kok Pandas' and 'Tashly', was selected in the analysis and demonstrates high hybridization efficiency in intraspecific crossing and in crossing with complex interspecific hybrids. Hybridological analysis of the progeny in F1 showed that the average index of resistance to oidium depends on the genetic characteristics of the parent components. Hybridological analysis showed that the most resistant progeny developed in the crossing of 'Khersonesskii' × 'JS 26–205' (6.8 points). It is established that a high degree of genotypically determined inheritance of the trait of resistance to oidium is observed in crossings with the participation of female forms of interspecific origin – 'Magarach No. 31-77-10', 'Muscat Jim' and male forms– 'Spartanets Magaracha' and 'Tsitronnyi Magaracha'. The forms selected to the elite in each population have different frost resistance. Such difference is observed in the population of 'Sary Pandas' x 'Tsitronnyi Magaracha' in the form 'Magarach No. 7-08-7-3': frost resistance is minus 22 °C, and in the form 'Magarach No. 7-08-15-3' it reaches minus 24°C. Almost all elite forms, in contrast to the initial Crimean native varieties in populations, are characterized by frost resistance higher by 2°С. Four genotypes 5–08–8-4 ('Misket' x 'JS 26205'), 10–08–4-4 ('Misgiuli Kara' x 'Ifigenia'), 10–08–8-3 ('Kefesiya' x 'Ifigenia') and 10–08–14–3 ('Misgiuli Kara' x 'Spartanets Мagaracha') were selected from the group of native grape varieties - donors of traits and obtaining hybrids of the first generation, which are improved analogues of the native grape varieties of Crimea.
